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Rotary steerable system for use in drilling deviated wells

Inactive Publication Date: 2000-09-12
WEATHERFORD U S INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prior art rotary steerable systems, in addition to being rather complex, have used the drilling fluid to actuate the moveable thrust members or pads.
No prior art rotary steerable system to applicant's knowledge has contained a reference device which utilizes a simple mechanical device to provide a gravity reference.

Method used

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Embodiment Construction

It will be appreciated that the present invention can take many forms and embodiments. Some embodiments of the invention are described so as to give an understanding of the invention. The specific embodiments described herein are intended to illustrate, and not to limit, the present invention.

With reference first to FIG. 1, rotating drill string 9 comprises drill bit 11 and top sub 12. Rotary steerable system 10 is connected in the drill string 9 between drill bit 11 and top sub 12 by threaded connections at its respective ends. Rotary steerable system 10 has a central bore which matches the central bores in drill bit 11 and top sub 12. Rotary steerable system 10 includes housing 8, and various types of material exist from which housing 8 may be fabricated. For example, various types of steel suitable for use in bottom hole assemblies may be used for housing 8.

Rotary steerable system 10 also includes a thrust member or pad 25 which is installed on the periphery of housing 8, as illu...

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PUM

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Abstract

A rotary steerable system for use in a drill string for drilling a deviated well is disclosed. The system utilizes a mechanical gravity reference device comprising an unbalanced weight which may rotate independently of the rotation of the drill string so that its heavy portion is always oriented toward the low side of the wellbore and which has an attached magnet. A magnetic switch that rotates as the drill string rotates is activated when its axis coincides with the axis of the magnet, and this activation results in a thrust member or pad being actuated to "kick" the side of the wellbore.

Description

1. Field of the InventionThe present invention relates to a rotary steerable system for use in drilling a deviated well.2. Description of the Prior ArtWhen drilling a hole in a subsurface formation, it is often desirable to be able to vary and control the direction of drilling. This is particularly true in the case of drilling a deviated well, i.e., one whose borehole is not perpendicular to the earth.Rotary drilling is defined as a method in which a bottom hole assembly, including the drill bit, is connected to the drill string which is rotatably driven from the drilling platform at the surface. Until recent years, fully controllable directional drilling has normally required the drill bit to be rotated by a downhole motor or a turbine. The drill bit may then, for example, be coupled to the motor by a bent unit whereby the central axis of the drill bit is inclined with respect to the axis of the motor. When variation of the direction of drilling is required, the rotation of the dri...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B7/06E21B17/10E21B17/00E21B7/08
CPCE21B7/06E21B17/1014
Inventor BUYTAERT, JEAN
Owner WEATHERFORD U S INC
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